What are the data link protocols for cellular networks?@GioMac I'm interested in knowing where you put your IP datagrams when sending user data (not voice or billing or whatever). As I mentioned, I want to be able to estimate the probability of packet loss at a given time, so I can probably send each IP datagram multiple times and get a slightly better probability of my data actually reaching its destination. I also want to know if it works the same way downstream and upstream. What communications standard do those protocols or technologies are related to?

What are the data link protocols for cellular networks?That's a rather good document. I'll read it in detail. However, it's unfortunately for GPRS which is pretty much obsolete. Where do you think I could have a better chance to get this question (and further subsequent questions as I dig deeper) answered? By the way, where did you find that document?